AO RTOS is small real time OS based on Active Object concurrency model
Real time preemptive embedded multi-thread kernel
A advanced graphical operating system.
A small operating system, compatible with MS-DOS, written in assemly
Project has been move to https://github.com/ciaa/Firmware
NuzulOS - pascal operating system
operating system for Intel 8086 / 8088
A rethinking of the Operating System Ecosystem.
A new simple operating system